What do you think about love

The day before yesterday,my best friend had said good-bye to her boyfriend, and these two days i had been with her.The reason for their break up is gap between them. the boy always wanted to make the girl more mature,because he thought his girlfriend was too childish, but girl are prefer to do herself, And they often quarrel. but after they broke up,girl was very sad and in her mind ,she believed it's because Of her self-will,i don't know how to comfort her.
I had suffered the same thing.i once loved a boy,a special boy.i was so love with him and he loved me too, unfortunately,he has a girlfriend.but she is far away from him.i know it's bad to fall in love with a boy who has girlfriend,but we can't help loving each other,we always date,go shopping together,watched movies...but he is a suspicious guy,he often asked me:Do you love me? or said:Oh,you don't love me as usual.finally,we broken up,i was so sad that i was always crying,i went to the movie which he had told me.and he was very sad too,he had written many sad sentences on his facebook.up to now,we had little contact each other,but i know i still love him,i remember what he loved, i remember that his  favorite singer is Jay Zhou and his dream but ,i missed him.
My friend,what do you think about love?